exposed data file publish date, improved logging

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Unit Tests - macos-latest-go-1.21

49 tests  ±0   49 :white_check_mark: ±0   48s :stopwatch: -2s  2 suites ±0    0 :zzz: ±0   1 files   ±0    0 :x: ±0 

Results for commit 3b7bb70f. ± Comparison against base commit 0a490100.

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Unit Tests - ubuntu-20.04-go-1.19

49 tests  ±0   49 :white_check_mark: ±0   49s :stopwatch: ±0s  2 suites ±0    0 :zzz: ±0   1 files   ±0    0 :x: ±0 

Results for commit 3b7bb70f. ± Comparison against base commit 0a490100.

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Integration Tests - macos-latest-go-1.21

0 tests  ±0   0 :white_check_mark: ±0   0s :stopwatch: ±0s 0 suites ±0   0 :zzz: ±0  0 files   ±0   0 :x: ±0 

Results for commit 3b7bb70f. ± Comparison against base commit 0a490100.

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Integration Tests - ubuntu-20.04-go-1.19

0 tests  ±0   0 :white_check_mark: ±0   0s :stopwatch: ±0s 0 suites ±0   0 :zzz: ±0  0 files   ±0   0 :x: ±0 

Results for commit 3b7bb70f. ± Comparison against base commit 0a490100.

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Unit Tests - windows-latest-go-1.21

46 tests   - 3   45 :white_check_mark:  - 4   21s :stopwatch: -25s  2 suites ±0    0 :zzz: ±0   1 files   ±0    0 :x: ±0   1 :fire: +1 

For more details on these errors, see this check.

Results for commit 3b7bb70f. ± Comparison against base commit 0a490100.

This pull request removes 3 tests.

``` github.com/51Degrees/device-detection-go/v4/onpremise ‑ TestCustomProvider github.com/51Degrees/device-detection-go/v4/onpremise ‑ TestExternalFileChangedMv github.com/51Degrees/device-detection-go/v4/onpremise ‑ TestExternalFileChangedReplace ```

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Unit Tests - ubuntu-20.04-go-1.20

49 tests  ±0   49 :white_check_mark: ±0   49s :stopwatch: ±0s  2 suites ±0    0 :zzz: ±0   1 files   ±0    0 :x: ±0 

Results for commit 3b7bb70f. ± Comparison against base commit 0a490100.

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Integration Tests - windows-latest-go-1.21

0 tests  ±0   0 :white_check_mark: ±0   0s :stopwatch: ±0s 0 suites ±0   0 :zzz: ±0  0 files   ±0   0 :x: ±0 

Results for commit 3b7bb70f. ± Comparison against base commit 0a490100.

[github-actions[bot]]

Integration Tests - ubuntu-20.04-go-1.20

0 tests  ±0   0 :white_check_mark: ±0   0s :stopwatch: ±0s 0 suites ±0   0 :zzz: ±0  0 files   ±0   0 :x: ±0 

Results for commit 3b7bb70f. ± Comparison against base commit 0a490100.